/*
 * Copyright 2007 David R Kirkland 
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");  
 * you may not use this file except in compliance with the License. 
 * You may obtain a copy of the License at 
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0 
 * 
 * Unless required by applicable law or agreed to in writing, software 
 * distributed under the License is distributed on an "AS IS" BASIS, 
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 * See the License for the specific language governing permissions and 
 * limitations under the License.
 */

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;
using NetSpider.IoC;
using NetSpider.Logging;

namespace NetSpider
{
    public static class DependencyResolver
    {
        private static IDependencyResolver _resolver;

        static DependencyResolver()
        {
            try
            {
                if (!Config.UseCustomResolver)
                {
                    _resolver = new WindsorDependencyResolver(Config.ComponentsFile);
                }
            }
            catch (Exception e)
            {
                Debug.WriteLine(e.ToString());
                throw;
            }
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="resolver"></param>
        public static void RegisterResolver(IDependencyResolver resolver)
        {
            _resolver = resolver;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <returns></returns>
        public static T GetImplementationOf<T>()
        {
            if (_resolver == null)
            {
                throw new Exception(
                    "UseCustomResolver was set to 'true' in the the app config, but no resolver was registered. Please use DependencyResolver.RegisterResolver to register an appropriate resolver implementation.");
            }

            return _resolver.GetImplementationOf<T>();
        }
    }
}
